Chapter 6. Files and I/O

Ruby Chapter 6.
Files and I/O

Checking if a directory exists

Ruby’s standard library provides straightforward methods to check for a directory’s existence.

Creating a temporary file

Ruby’s standard library provides Tempfile for creating temporary files.

Reading a text file

Reading a file in Ruby is straightforward.

Reading command line arguments

To grab command-line arguments, Ruby provides a simple array.

Writing a text file

Ruby makes file operations straightforward.

Writing to standard error

Ruby’s standard library provides a straightforward way to write to stderr using $stderr or STDERR.